Using Windows Small business server 2003 remote access

I believe this is a security issue.
I am using Vista to connect to a WSBS 2003 via remote access.
Everything works until I want to send, reply or forward a message.
for example....
I click on 'new message' and a new window is created. All input fields are
there except for the actual message text block. It has a small 'x' in the top
left hand corner and the text box itself is a different color. It will not
accept any text. There are no error messages.
The site I am connecting to is trusted.
NOTE: this does not happen on my XP pro machine!
Please advise.
GH

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Guy Huntingford
Calgary, Alberta